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I've added the WP8.1 project as per Xamarin's guide.
This happens only in case of ViewCell.
Steps to reproduce:
1) Create ListView
2) Create a ViewCell in its DataTemplate
3) Put label in the ViewCell
4) Bind the label
5) Load contents in ListView
6) Scroll down
7) Scroll up
If font size is small, the lines disappear
If font size is medium/large, the text gets cut
I'm attaching a sample project.
If you dont get the bug, try uncommenting some of the code that adds more items. This is usually happening when items are Added. I didnt get the bug a few times when the ObservableCollection is directly created from another.
Also, if frame is used, the whole listitem disappears.
Created attachment 12844 [details]
I had to delete packages to reduce size. Please re add them.
Also, if you dont get the bug, try uncommenting some of the code which adds more items to the listview
I can no longer reproduce this issue when using Forms 126.96.36.199.